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"Rail travel at high speeds is not possible because passengers, unable to breathe, would die of asphyxia."
Dionysius Lardner, Professor of Natural Philosophy and Astronomy at University College, London ; 1830
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| Number | Title | Issue Date |
| 4305077 | System for measuring current position and/or moving direction of vehicle A reference station is provided at a fixed position. The station is adapted to transmit a scanning signal the transmitting direction of which is scanned in succession in different directions, a positional information signal representative of the position ... | 12/08/1981 |
| 4277771 | Electric induction field navigation apparatus Apparatus for use by the operator of an aircraft in guiding the aircraft, in areas where electric power lines are in operation. Pickup means are located at three or more locations on the aircraft and are used to detect three orthogonal components of the "... | 07/07/1981 |
| 4215345 | Interferometric locating system A system for determining the position of a vehicle or other target that emits radio waves, which is of the type that senses the difference in time of arrival at spaced ground stations of signals from the vehicle to locate the vehicle on a set of intersect... | 07/29/1980 |
| 4173760 | Passive acquisition system The present invention provides a method and apparatus for effecting, in a ssive manner, the acquisitioning of a broadband barrage jammer type radar target, by detecting the differential delay between the barrage signal as received at a predetermined locat... | 11/06/1979 |
| 4109250 | Circuit for the comparative vector measurement of radio signal pulses which arrive approximately simultaneously in a plurality of receivers A circuit for the comparative vector measurement of keyed radio signal pulses, in particular DME pulses which arrive virtually simultaneously in a plurality of receivers and which can exhibit large level differences is utilized where, in each receiver, th... | 08/22/1978 |
| 4101894 | Radio beacon for a nautical emergency rescue system A radio beacon for a nautical emergency rescue system includes a flotation housing containing an antenna in an upper portion, a ground plane and a transmitter in a central portion, and batteries in a lower portion. When placed in the water, the lower sect... | 07/18/1978 |
| 4067015 | System and method for tracking a signal source A system for tracking moving signal sources is disclosed which is particularly adaptable for use in tracking stage performers, although a wide range of other uses is possible. A miniature transmitter is attached to the person or object to be tracked and e... | 01/03/1978 |
| 4041495 | Apparatus for determining the position of a object The position of an object which moves along a fixed path is determined by measuring the phase displacement of two signals received from demodulators connected to an aerial located along the path. A transmitter carried by the objects feeds signals to the d... | 08/09/1977 |
| 4021807 | Beacon tracking system A radio frequency transmitter is hidden within a packet of currency which may be mingled with other currency packets in the cash drawer of a bank, convenience store or other such commercial institution. The transmitter is automatically activated by unauth... | 05/03/1977 |
| 3996590 | Method and apparatus for automatically detecting and tracking moving objects and similar applications This invention relates to an improvement in the art of navigating, detecting and tracking moving objects, position finding, mapping and such subjects employing a plurality of stations and variational measurements.... | 12/07/1976 |
| 3940700 | Method and installation for the detection of a source generating electro-magnetic oscillations A method for the detection of a source generating electro-magnetic oscillations wherein for the purpose of eliminating disturbances caused by foreign transmitters there is measured the field intensity at at least two spatially separate locations, the dete... | 02/24/1976 |
